<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script type="module">
    import { reactive, effect } from './mini-reactivity.js'

    const product = reactive({
      name: 'iPhone',
      price: 5000,
      count: 3,
      company: {
          name: 'apple'
      }
    })
    
    let total = 0;
    effect(() => {
      total = product.price * product.count
    })
    console.log(total)

    product.price = 2000
    console.log(total)

    product.count = 1
    console.log(total)

  </script>
</body>
</html>